First of all, understand that malignant tumors have a genetic predisposition, but are not typical genetic diseases and will not be passed directly to offspring like some genetic diseases. The hereditary nature of malignant tumors, or the tendency for families to aggregate, is generally manifested by a higher susceptibility to tumors than those without a family history. The carrier of genetic information —-DNA Therefore, if one parent has a malignant tumor, the child should have a higher level of vigilance. For example, if the mother has breast cancer, then the daughter usually pays attention to the physical examination of breast, ultrasound or mammogram or breast MRI; if the parent has gastrointestinal tumor, then the child should develop the habit of regular re-examination of gastroscopy after 30 years old (if the gastroscopy is fine, it can be reviewed at an interval of 3-5 years, which can basically prevent gastrointestinal cancer; if gastrointestinal polyps are found, especially large intestinal polyps, they must be removed in time, because (The vast majority of colon cancer is the evolution of polyps, so it is said that colorectal cancer is a preventable cancer, after polyps are removed, review the colonoscopy again at an interval of one year, find polyps and remove them again, and review again one year after surgery, knowing that there are no new polyps, then the review time can be extended in the future). Pay attention to breast examination to reject breast cancer If there is a family history of liver cancer, pay attention to whether there is hepatitis B or C in the family, and if there is, actively antiviral treatment to stop the cancer process. Early detection of hepatitis disease and active antiviral treatment can save your life. Don’t think that regular antiviral treatment is neglected because of normal transaminases and delayed by yourself, antiviral treatment should be treated in infectious disease department, not just go to small clinics. Active anti-hepatitis B and C virus treatment to prevent liver cancer In conclusion, if you have immediate family members with cancer, you are generally a high-risk group for cancer and need to pay attention to your body changes and have regular medical checkups just in case.